#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <iostream>
#include <sstream>
#include <string>

using namespace testing;
using namespace std;


TEST(StringCombineAllTest, should_find_first_of)
{
    // string result = "a"+"b";//会报编译错误
    string result = string("a")+string("b");
    result.append("c");
}